diff --git a/libavfilter/vf_epx.c b/libavfilter/vf_epx.c
index 9d79648ac1..d706229ab8 100644
--- a/libavfilter/vf_epx.c
+++ b/libavfilter/vf_epx.c
@@ -100,7 +100,7 @@ static int epx2_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
             src_line[1] = src_line[2];
             src_line[2] = src_line[1];
 
-            if (y < height - 1)
+            if (y < height - 2)
                 src_line[2] += src_linesize;
         }
     }
@@ -187,7 +187,7 @@ static int epx3_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
             src_line[1] = src_line[2];
             src_line[2] = src_line[1];
 
-            if (y < height - 1)
+            if (y < height - 2)
                 src_line[2] += src_linesize;
         }
     }